package cn.yunzhisheng.vui.assistant.database;

import android.app.ActivityManager;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteException;
import android.net.Uri;
import android.util.Log;
import android.widget.Toast;

public final class SqliteWrapper {
	private static final String TAG = "SqliteWrapper";
	private static final String SQLITE_EXCEPTION_DETAIL_MESSAGE = "unable to open database file";

	private SqliteWrapper() {
	}

	@SuppressWarnings("unused")
	private static boolean isLowMemory(Context context) {
		if (null == context) {
			return false;
		}

		ActivityManager am = (ActivityManager) context
			.getSystemService(Context.ACTIVITY_SERVICE);
		ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
		am.getMemoryInfo(outInfo);

		return outInfo.lowMemory;
	}

	private static boolean isLowMemory(SQLiteException e) {
		return e.getMessage().equals(SQLITE_EXCEPTION_DETAIL_MESSAGE);
	}

	public static void checkSQLiteException(Context context, SQLiteException e) {
		if (isLowMemory(e)) {
			Toast.makeText(context, "Low memory!", Toast.LENGTH_SHORT).show();
		} else {
			throw e;
		}
	}

	public static Cursor query(Context context, ContentResolver resolver,
								Uri uri, String[] projection, String selection,
								String[] selectionArgs, String sortOrder) {
		try {
			return resolver.query(
				uri,
				projection,
				selection,
				selectionArgs,
				sortOrder);
		} catch (SQLiteException e) {
			Log.e(TAG, "Catch a SQLiteException when query: ", e);
			checkSQLiteException(context, e);
			return null;
		}
	}

	public static boolean requery(Context context, Cursor cursor) {
		try {
			return cursor.requery();
		} catch (SQLiteException e) {
			Log.e(TAG, "Catch a SQLiteException when requery: ", e);
			checkSQLiteException(context, e);
			return false;
		}
	}

	public static int update(Context context, ContentResolver resolver,
								Uri uri, ContentValues values, String where,
								String[] selectionArgs) {
		try {
			return resolver.update(uri, values, where, selectionArgs);
		} catch (SQLiteException e) {
			Log.e(TAG, "Catch a SQLiteException when update: ", e);
			checkSQLiteException(context, e);
			return -1;
		}
	}

	public static int delete(Context context, ContentResolver resolver,
								Uri uri, String where, String[] selectionArgs) {
		try {
			return resolver.delete(uri, where, selectionArgs);
		} catch (SQLiteException e) {
			Log.e(TAG, "Catch a SQLiteException when delete: ", e);
			checkSQLiteException(context, e);
			return -1;
		}
	}

	public static Uri insert(Context context, ContentResolver resolver,
								Uri uri, ContentValues values) {
		try {
			return resolver.insert(uri, values);
		} catch (SQLiteException e) {
			checkSQLiteException(context, e);
			return null;
		}
	}
}
